Q: Where is my .bash_profile file located?

You have to create it, it doesn't exist yet. How you do that is up to you since it is invisible, so even after you do create it you still can't see it. So what you can do is open Terminal.app and say (drag this text into Terminal):

touch .bash_profile

then say:

open -a TextEdit.app .bash_profile

TextEdit will show you a blank page which you can fill in.

Where should I create it?

In your user folder, /Users/UserName.

1- Open terminal

2- Type 

cd /Users/UserName

3- Create file 

touch .bash_profile

4-Open file to edit

open .bash_profile

I hope that helps

Thanks it helped

Thanks

Worked thanks